Samsung S6 EDGE NOT WORKING

I have my Samsung S6 Edge for less than 4 months and has been giving me connection issues, dropping calls, cannot answer calls at times for the past month and a half. I took it to Vodacom Fourways and Westgate and all they did was change settings from 3G/4G to Gsm. This has not helped.I have taken it to the Samsung service centre in Nicolway and Im told that it needs a board replacement. My colleque and I got the phones on the very same day it as launched the 10th April 2015 and both are having the same issue. What puzzles me is that he is getting his replaced while I'm told mine needs a board replacement. This phone is still new and less than 4 months old and its already giving issues. Sorry I cannot accept a refurbished phone. Opening the phone and replacing the board qualifies a refurbished phone to me. This is a high end phone and I expect it to work like a high end phone. This phone is still new and i shouldn't be getting such issues.<br> My brother uses the same phone that he bought 2months after mine and his works very well with no issues. I use the same sim card on my Nokia 1520 and I get no signal losses, this rules out the sim connection. <br> The job number is HQ126630<br>